/**
 * Copyright 2016 Dolphin Emulator Project
 * Licensed under GPLv2+
 * Refer to the license.txt file included.
 */

package org.citra.citra_emu.overlay;

import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Rect;
import android.graphics.drawable.BitmapDrawable;
import android.view.MotionEvent;

/**
 * Custom {@link BitmapDrawable} that is capable
 * of storing it's own ID.
 */
public final class InputOverlayDrawableDpad {
    public static final int STATE_DEFAULT = 0;
    public static final int STATE_PRESSED_UP = 1;
    public static final int STATE_PRESSED_DOWN = 2;
    public static final int STATE_PRESSED_LEFT = 3;
    public static final int STATE_PRESSED_RIGHT = 4;
    public static final int STATE_PRESSED_UP_LEFT = 5;
    public static final int STATE_PRESSED_UP_RIGHT = 6;
    public static final int STATE_PRESSED_DOWN_LEFT = 7;
    public static final int STATE_PRESSED_DOWN_RIGHT = 8;
    public static final float VIRT_AXIS_DEADZONE = 0.2f;
    // The ID identifying what type of button this Drawable represents.
    private int[] mButtonType = new int[4];
    private int mTrackId;
    private int mPreviousTouchX, mPreviousTouchY;
    private int mControlPositionX, mControlPositionY;
    private int mWidth;
    private int mHeight;
    private BitmapDrawable mDefaultStateBitmap;
    private BitmapDrawable mPressedOneDirectionStateBitmap;
    private BitmapDrawable mPressedTwoDirectionsStateBitmap;
    private int mPressState = STATE_DEFAULT;

    /**
     * Constructor
     *
     * @param res                             {@link Resources} instance.
     * @param defaultStateBitmap              {@link Bitmap} of the default state.
     * @param pressedOneDirectionStateBitmap  {@link Bitmap} of the pressed state in one direction.
     * @param pressedTwoDirectionsStateBitmap {@link Bitmap} of the pressed state in two direction.
     * @param buttonUp                        Identifier for the up button.
     * @param buttonDown                      Identifier for the down button.
     * @param buttonLeft                      Identifier for the left button.
     * @param buttonRight                     Identifier for the right button.
     */
    public InputOverlayDrawableDpad(Resources res,
                                    Bitmap defaultStateBitmap,
                                    Bitmap pressedOneDirectionStateBitmap,
                                    Bitmap pressedTwoDirectionsStateBitmap,
                                    int buttonUp, int buttonDown,
                                    int buttonLeft, int buttonRight) {
        mDefaultStateBitmap = new BitmapDrawable(res, defaultStateBitmap);
        mPressedOneDirectionStateBitmap = new BitmapDrawable(res, pressedOneDirectionStateBitmap);
        mPressedTwoDirectionsStateBitmap = new BitmapDrawable(res, pressedTwoDirectionsStateBitmap);

        mWidth = mDefaultStateBitmap.getIntrinsicWidth();
        mHeight = mDefaultStateBitmap.getIntrinsicHeight();

        mButtonType[0] = buttonUp;
        mButtonType[1] = buttonDown;
        mButtonType[2] = buttonLeft;
        mButtonType[3] = buttonRight;

        mTrackId = -1;
    }

    public void draw(Canvas canvas) {
        int px = mControlPositionX + (getWidth() / 2);
        int py = mControlPositionY + (getHeight() / 2);
        switch (mPressState) {
            case STATE_DEFAULT:
                mDefaultStateBitmap.draw(canvas);
                break;
            case STATE_PRESSED_UP:
                mPressedOneDirectionStateBitmap.draw(canvas);
                break;
            case STATE_PRESSED_RIGHT:
                canvas.save();
                canvas.rotate(90, px, py);
                mPressedOneDirectionStateBitmap.draw(canvas);
                canvas.restore();
                break;
            case STATE_PRESSED_DOWN:
                canvas.save();
                canvas.rotate(180, px, py);
                mPressedOneDirectionStateBitmap.draw(canvas);
                canvas.restore();
                break;
            case STATE_PRESSED_LEFT:
                canvas.save();
                canvas.rotate(270, px, py);
                mPressedOneDirectionStateBitmap.draw(canvas);
                canvas.restore();
                break;
            case STATE_PRESSED_UP_LEFT:
                mPressedTwoDirectionsStateBitmap.draw(canvas);
                break;
            case STATE_PRESSED_UP_RIGHT:
                canvas.save();
                canvas.rotate(90, px, py);
                mPressedTwoDirectionsStateBitmap.draw(canvas);
                canvas.restore();
                break;
            case STATE_PRESSED_DOWN_RIGHT:
                canvas.save();
                canvas.rotate(180, px, py);
                mPressedTwoDirectionsStateBitmap.draw(canvas);
                canvas.restore();
                break;
            case STATE_PRESSED_DOWN_LEFT:
                canvas.save();
                canvas.rotate(270, px, py);
                mPressedTwoDirectionsStateBitmap.draw(canvas);
                canvas.restore();
                break;
        }
    }

    /**
     * Gets one of the InputOverlayDrawableDpad's button IDs.
     *
     * @return the requested InputOverlayDrawableDpad's button ID.
     */
    public int getId(int direction) {
        return mButtonType[direction];
    }

    public int getTrackId() {
        return mTrackId;
    }

    public void setTrackId(int trackId) {
        mTrackId = trackId;
    }

    public boolean onConfigureTouch(MotionEvent event) {
        int pointerIndex = event.getActionIndex();
        int fingerPositionX = (int) event.getX(pointerIndex);
        int fingerPositionY = (int) event.getY(pointerIndex);
        switch (event.getAction()) {
            case MotionEvent.ACTION_DOWN:
                mPreviousTouchX = fingerPositionX;
                mPreviousTouchY = fingerPositionY;
                break;
            case MotionEvent.ACTION_MOVE:
                mControlPositionX += fingerPositionX - mPreviousTouchX;
                mControlPositionY += fingerPositionY - mPreviousTouchY;
                setBounds(mControlPositionX, mControlPositionY, getWidth() + mControlPositionX,
                        getHeight() + mControlPositionY);
                mPreviousTouchX = fingerPositionX;
                mPreviousTouchY = fingerPositionY;
                break;

        }
        return true;
    }

    public void setPosition(int x, int y) {
        mControlPositionX = x;
        mControlPositionY = y;
    }

    public void setBounds(int left, int top, int right, int bottom) {
        mDefaultStateBitmap.setBounds(left, top, right, bottom);
        mPressedOneDirectionStateBitmap.setBounds(left, top, right, bottom);
        mPressedTwoDirectionsStateBitmap.setBounds(left, top, right, bottom);
    }

    public Rect getBounds() {
        return mDefaultStateBitmap.getBounds();
    }

    public int getWidth() {
        return mWidth;
    }

    public int getHeight() {
        return mHeight;
    }

    public void setState(int pressState) {
        mPressState = pressState;
    }
}
